Structural analysis for temporary construction structures 1

[Okiryu]

Hi, do you know if there are any criteria/guidelines documents for structural analysis for temporary construction structures? Basically, I am looking for some guidelines for analysis/design of scaffolding structures for construction purposes.

Also, do you know any special structural requirements (max. deflection, max. drift, etc.) from OSHA or other entities?

Thanks !

 

[KootK]

I don't know the specific answers to your questions but ASCE 37 might be a good place to start looking if you have access to a copy.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[Okiryu]

Thanks KootK. I do not have that document, but I will check on how to get it.

 

[WinelandV]

Okiryu,

I spent almost 4 years designing temporary structures. OSHA has guidance, but there are grey areas there (food for thought: does a bridge overhang bracket fall under OSHA falsework/formwork provisions, or walkway provisions?).

Concerning scaffold specifically, most manufacturers have publish (or at least share) the information needed to make their product work. Such as, horizontal bracing at every x feet vertically, maximum allowable bending or compression, etc.

If your scaffolding is supporting concrete, then your casting limits will control your deflections. If it's supporting work platforms, you're going to want to limit deflections to what will make the workers comfortable - so I'd recommend going with the standard deflection requirements for buildings.

If you're a 3rd party to the contractor who needs the temp engineering work, they may have internal policies stipulating deflection requirements.

And as KootK suggests, ASCE 37 is a great resource for temporary loads on structures.

I hope this helps.

 

[Lomarandil]

I'd also look at the California Falsework Manual -- it's the unofficial code of temporary structures.

http://www.dot.ca.gov/hq/esc/construction/manuals/OSCCompleteManuals/FalseworkManual.pdf

If the project is transportation related, many DOTs also have their own deflection criteria. (Many are L/270, California is L/240 for example)

 

[Okiryu]

Thanks for your responses...Lomarandil, that is a very nice reference. It includes also some calculation examples...thanks again !